package com.lihaozhe.util.string;import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;/*** 字符串工具类** @author 李昊哲* @version 1.0*/
public class StringUtils {/*** 去除字符串左边的的空格** @param string 原始字符串* @return 去除左边空格后的字符串*/public static String ltrim(String string) {if (string == null) {throw new NullPointerException();} else {return string.replaceAll("^\\s+", "");}}/*** 去除字符串右边的的空格** @param string 原始字符串* @return 去除右边空格后的字符串*/public static String rtrim(String string) {if (string == null) {throw new NullPointerException();} else {return string.replaceAll("\\s+$", "");}}/*** 生成的UUID是带-的字符串，类似于：a5c8a5e8-df2b-4706-bea4-08d0939410e3** @return 带-的字符串*/public static String randomUUID() {return UUID.randomUUID().toString();}/*** 生成的是不带-的字符串，类似于：b17f24ff026d40949c85a24f4f375d42** @return 不带-的字符串*/public static String simpleUUID() {return randomUUID().replace("-", "");}/*** 随机字符串** @param count 随机字符串长度* @return 随机字符串*/public static String random(int count) {String codePool = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";StringBuilder sb = new StringBuilder();for (int i = 0; i < count; i++) {sb.append(codePool.charAt(ThreadLocalRandom.current().nextInt(codePool.length())));}return sb.toString();}/*** 随机数字** @param count 随机数字长度* @return 随机数字*/public static String randomNumeric(int count) {String codePool = "0123456789";StringBuilder sb = new StringBuilder();for (int i = 0; i < count; i++) {sb.append(codePool.charAt(ThreadLocalRandom.current().nextInt(codePool.length())));}return sb.toString();}/*** 判断字符串是否为空** @param string 判断参数 string 是否为空* @return 参数为 null 或者 参数的长度为零 返回 true 其余情况返回 false*/public static boolean isEmpty(String string) {if (string == null || string.length() == 0) {return true;}return false;}/*** 判断字符串是否为空** @param string 判断参数 string 是否为空* @return 参数为 null 或者 参数收尾两端去掉空格后的长度为零 返回 true 其余情况返回 false*/public static boolean isBlank(String string) {if (string == null || string.trim().length() == 0) {return true;}return false;}/*** 获取文件后缀名** @param fileName 原始文件名* @return 文件后缀名*/public static String getExtension(String fileName) {int index = fileName.lastIndexOf(".");if (index == -1) {return "";}return fileName.substring(index + 1);}
}